作者:W. James Hammar、Mark A. Rustad
DOI:10.1002/jhet.5570180507
日期:1981.8
A reaction sequence involving halogenation and replacement of the halo substituent by a nitro group using dinitrogen tetraoxide has led to a general, convenient route to 5-nitrooxazoles. Reaction schemes employing both bromine and iodine as the halo substituent have been investigated; however, the method using iodine preceded by a mercuration step affords a better overall yield in the range of 20–50%
涉及卤化和使用四氧化二氮用硝基取代卤素取代基的反应序列已导致制备5-硝基恶唑的一般方便途径。已经研究了同时使用溴和碘作为卤素取代基的反应方案。但是,在碘化步骤之后使用汞的方法,总产率在20%至50%范围内更好。虽然后者的总收率较低(4–12%),但可以通过后一序列制备2-和4-硝基-恶唑。